Well, asking about the length of a typical sofa bed is a bit like asking about the length of a typical movie – are we talking about a short film or an epic trilogy? While the provided context was about as useful as a chocolate teapot, I can certainly shed some light on the subject.
Generally, the length of a sofa bed is determined by the size of the mattress it's trying to hide. The most common size you'll find is a Queen. When it's masquerading as a sofa, this type is typically between 80 and 95 inches long from arm to arm. This is the size most people picture when they think of a standard three-seater sofa that happens to have a secret identity.
If you're working with a smaller space, you might opt for a loveseat-style sleeper, which usually contains a Full-size mattress. These tend to run somewhere between 70 and 85 inches long. And for those truly tight spots, there's the chair-and-a-half sleeper, which unfolds into a Twin bed and measures a compact 50 to 60 inches wide.
Of course, the most important length might be how far it extends into your room when it's fully transformed. When you pull out the bed, most sofa sleepers will measure about 85 to 95 inches from the back of the sofa to the foot of the mattress. So, before you buy, it's wise to measure not just where the sofa will sit, but also the space where your future guests will sleep, unless you want them to have to open a window to stretch their toes.
